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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fa55a9930b6b2070758ea2743b4ea8b4c48feffb2e62011df3ee083447c882' 
  AND token = '3UTDVk82yLBDP6WkJrX1SHJkg6rmpbo7h2fgsbdpJhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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