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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7151aeb242c8e0b66fcd22185fe705b4954b92439550ecc43f356a5c51f48ede' 
  AND token = 'tsz4GByEvhoVAWR8eiyk9L/39aqFsSScLUgAmpjkfZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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