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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4c136cb6db65bd5b5ed874af7e5dbeae1b5066e53454e60a219aec53702856' 
  AND token = 'B6wzoPvSsWVxBpVsZ3asatNNc9l+L1Cw5CGas4N5sA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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