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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54580cfa999d8b26ee5cc634a2c9a233629f70ae72c700700fa4ec2f4c786f04' 
  AND token = '83i/z88q7DTF4YRtnnvieTUKHb1ZbCm/8UksnDt9PBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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