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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd995e9200ad2e3e510e17ecdbdfbc05a142582a50c811ae075e7d3641a5ea34' 
  AND token = 'M+tdlvTy4uzG+c40FgVa/zDiM386G6bbJd+HaKqCR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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