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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b432ccbdaa1d19a581ccf77d3a1deac2a5962a2ebab675103c32407aa0a28d1' 
  AND token = 'CvgACdG+qoDS7MVk3C+7YCNtnzydygHFkkxCB4UanRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}