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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cd0dbe5126f12c07f0a7dac3ab5e29bb38b0494a297db54508afc9ed941aa3' 
  AND token = 'dn7bHt1N+unY3OwBx4+jxH//iKDu+wc2w39O08Hbluc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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