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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3cf0435fa9aebc2d953f4a6fedce7af97af054cec3f65d30a0f373d894fa59' 
  AND token = 'huRPQBaDS5p4l/60fmhBCz1Pjrc1/hz0NJui3mNV3Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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