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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61308f4c0c9acf9aaf481bcb2b4b55c3ec95790b10522c6132ac51679124a0bf' 
  AND token = 'HrI783W4ta0GWstyZ8lm+R41S3/GhK1qkHLPwJc5DXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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