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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d3c7b32f766042556d9608d4b1719fe2e56ed26d652d7320a990a311895a4d' 
  AND token = 'DFBP8Kz0zl6LDufldVlwnHFECXAZrg8tkX75kHE8G0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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