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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a233945007bc8f8c3fc8760e964c77c8bbef3b9a939ccdb840e572ccd3e025' 
  AND token = 'dkaDgBbFqPcc+AFy+Crr8z3BlUa9QKuzEngi6VKcsl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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