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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf4732a3e231d2a0c3294b1b76d7f2d03cdb7300f18959f3da10b30f80144f5' 
  AND token = 'VAB0FNgPx+1ec4T6vE92Uc5qcs27K2yLZ0VPJnluTio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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