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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75024c7d87914b8f6dce424bd7bf46bfb271f05d87b99cd1cd6b1d23299f1a93' 
  AND token = '+VcWUQT6TyNzSAzLUlHpwKMAb3O2A+Kavb1RSp7agdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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