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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e830beccbb48da0070bed79ecb483b9139f59c83d668be6c0be6ccffee23fe67' 
  AND token = '0pO/yKmi4kblqJRJId0DsHX/1ohBL4ZkGYIcfb3xQZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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