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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca379e0b770afd8cc5bbc9417aced97f82ba337a9f96d48b2a983e9143a20bda' 
  AND token = '4AQLmiew3yXwbyyhosiEkYdk5S3avy0p1hXvZAEWYe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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