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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76942d4ba9051c6acf0b4bf673e9062d46720ef590feae73394308249ddc06c' 
  AND token = 'hQqk2nuPw7BPechfOt+vjk0MiFiD27Qhlg8X8fbCtr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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