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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a29817e9d8e4cb370772b69b15927187b6ab9c4134c538b7afed663472a7cd' 
  AND token = 'b/4TRgLy6GnLB3O2KHFyD7Ue0IUx9D+ka627Zznk7s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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