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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc19b54ee8ae33b4f27a0b6ea190cb672f7dd19b475745fc381d2b07b684be2e' 
  AND token = '8uoj7AoykW4zzryBDAOC0kigy5rtuFrJzpczjO3lqrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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