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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58259025fedb9632abbf07d383e7ad37c1a8aef023a3d9d440bd9c047e7e56f8' 
  AND token = '3SHT7a9uXl3Sg847SWX2sz0nnv+r63gY38Fm6Hz+4J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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