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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440a4eefea26b4c720ae15d87204191c17576fc19c5b4c59fe56cb9afd6d1469' 
  AND token = 'enXu9dLfazqng2a1aej+0ZteH+3gXiGmxacsXSHab/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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