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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9652ca72229bbfb155fb676d0d80a5d86540b831c4d362cfdb6b655bc68cd67e' 
  AND token = 'qsR6heNbCYeVsdr1qu1TbwBf0kStM10sZubxhSVQV4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00185

JSON explain

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