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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1377e2d4077b654170447f0cd5176c104cf507ba0838ac57ff17ebde26d7c6a9' 
  AND token = 'VJ2BJun1an0HiXg4t45EZXeMMEP8Z3bIcKLmjdxvRBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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