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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149688cef80fa0a10785fd24d84528ae09f7301939b75246de0730b74586ecb6' 
  AND token = 'DJWDSt7jKRrVcs+3d9nMBq9Hjco6s3qVYWiLDR+3lBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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