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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7234d6358bec57f5d710dd8e7979691113bc02a0f40691fedd4f262e3320e2b' 
  AND token = 'k0ny5XDYEyzgH3s2Fs0fisy8338WLTWA6Af76SjRJk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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