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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916ebf3b696e6778dbdf8425048297474d8f8c53f32a781f346c30abfe8f92aa' 
  AND token = 'ekOJg+/f/82DwoeD1fiZr632iY7LKAGe5N5WV3IN9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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