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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827e369ea35b6775734cce3439502e92e33154fcfc8b70bf37ef6500ad93762d' 
  AND token = 'vjUzdK2CIi/LxJs5I2KcFeMoGmJ0N9EWo7UR2anA76Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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