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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5f47b91a8c46bcd679a5f6c2326cb3300f8ee01946b42bded533b292e1fc8c' 
  AND token = '60ox3dPeUZbz+5HV5YGrSGRWXFHiG92HsG98RO3c130=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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