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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e238833961ddc60f9526187c6c2183091967c44e6d94ff5b0fb64d12a1f0aab' 
  AND token = 'xcXxho70agGUR6DVKfuMes7z4QnPNCb/9t3RsWCNLCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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