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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01084a5d2607978cc472cb034c8b98a1473e24b70671b8e5398181dcd24d907b' 
  AND token = '785okGBHDYg1zG/xT3sa6DdnaIaSR++z+opJIYsZ6YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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