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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d53236ebc243135ebab14e48e61f1a82a7bb539b7f9c407e588cad606e2a310' 
  AND token = 'ddmVXMtoy/aW5wVz/N2yF31OXjOX+kloTRVCR3ydXSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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