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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0fdae67e06038b4c2090c0d9d1f048d4942aa668647ed51c9f8ec2628c38db' 
  AND token = 'SlOFdWhR0bLi43+LKrlX/BzQvxju/swYyi0aqtrlFlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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