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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3702adde0f229e16fbb7e2e27b1cef9ae07ba2dd69c4bbeb14823a91af7117a9' 
  AND token = '7qLaTvsZKZvbyYNT3dstvFfWydVvktQm3fxLRwmV6ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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