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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9eadccff4b31a74bd2a71384715d972391fe539cb18d28592079c9b3dd3dac' 
  AND token = '2Ap6WpAc+FVVQvaOUrM1B541pp0/p4ij1t9iu/e7O94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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