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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f83eabab8ae7088069c83c32c1e48689a4446a1885c05a87c89b3b60c80894c' 
  AND token = 'IURtkyZvTbuyqSUP/PPP6OQiQCysqCCmYB0rWCg7vTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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