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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0b751363d87b167478ebea3091c1f928f29b2bc320d330d01d1dc890574e8d' 
  AND token = 'oMlVxqxmieVck93CXVEZ4a3RTdAOVVoWxiQl+aHfctU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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