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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f318053662477d5dd69cd606fa6f0809d3724503f9b815239d0682448fbf464' 
  AND token = '/bMWWJPi7pGXLAFjmm8ev9nekTKM7CTBbDLUEaW/q4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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