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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb307914136b63181ae2275e11023606140f2948e4c9b4a6141a4c0e33bf9e44' 
  AND token = 'zFbm3kyEihNNk5Xlb5ykPtk5TayzPUjDhN7GFaWJf/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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