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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9628221924ef368d5bacd3286493648515c3df430b2e7ef56294f0ec368310fc' 
  AND token = 'udeb+3NtPmISSIoaLTBgh425GBiPd7KxpUM1qm2xxvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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