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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38978bf162f620fdf2fe247d10ba45d2a859d43a266961d597be48e00888d391' 
  AND token = '5QOuSQGZIkO9eV+8ONlo9qUUy8B7CBIdVYtAAQF2znI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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