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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0969dac1fe5efb9205b501d1e1a87b1c5a62e32b5ad51f94048176c204e17c2d' 
  AND token = 'fmprC4RxctDUABlRh87NPE5cYx6nZN9Z2h0RW1jvJds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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