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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afaff88e665b0a940f9ce4ab7e61a4fb8614752f887469f6761cbc21b492fc8' 
  AND token = 'OSZmp7EzbTfFnkQzYeNweCft89mGlzDev2Gx56qcQ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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