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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ac0e48ab85afad0e635fc2e8f89987ea1f1440e27d0dba948f037620c127e6' 
  AND token = 'N4B6R3pESeum6g8cKbrkTI75ELs/jP9LI88gegY0IO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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