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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1e6838a1595207886e24be76fc16416bfbb16c27073591c79a1ff2898317d8' 
  AND token = 'n71ZN4aETQ7hmVi+k7c2I9dvf+ouXgf5KdiWgT1/CUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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