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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeca82fc9c6e0431db9b7aa2c8ec8581beca4b40852ba3d433ad2a7a0747e01c' 
  AND token = 'k440g6wQlSymE7xkkghMPE4T5NSWtxlWHouaG7OGsAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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