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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80825e52e475e3f6b25d835352a3549799c376bbe029266d372aefa3cb7b7ab4' 
  AND token = 'LDtJxm8ouf9erLfMkhLMUtUO6lnYX8u7igmnI2E59Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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