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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3ae2cd80501dfffed07d0f27e3c87780a9f20d78434b152f80a15397726404' 
  AND token = 'eiK1eSiyDFlQj20jK1mmjhpOj+6cQt84F+/y4xYG6tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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