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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c49b092175ab603c47c1ac5b188ef0f3c43730647cc11de9345aa3912c19dc4' 
  AND token = 'zkE+YhyYUVleg0o0wi6G3MMlvvUoC9CRV7YuXR+rvdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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