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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7287e345cfc40c762f48d092e230102f577ec80d831addf47f25e0aa4f6dc6aa' 
  AND token = 'K33+GoMiMncHtcG2UaGVaGUz07KK/z5fiQJirVsC+Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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