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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d26bf5012dd52534ff590e8490bed03a65e0e0f7667fedd4da3e7ba1d0a1ef' 
  AND token = 'uCW5EPoBEncCoWj6Ms6mlEnlwD/KHnMhdkHToKdOtRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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