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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dee5c17b966db199960d278bc251a748491058e845ac5753782b4bd24da28a' 
  AND token = 'jE5x3SZs9hbQrrp+c2nyj+zLnm4GPPArpV2OuJZ1xE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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