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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ee1841a273749d6ae0ea5bced17a6ec2f380a9886d4e8f0c2c0e2e46e3377f' 
  AND token = 'wWy+5ktLEnSmdD59C9b3NA/Wrrx3puqXPfz6fyFF5TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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