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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e860a3b02cdda7b8af46cfb3e76a223108f7728f041221f5d5bff7b9dbca509d' 
  AND token = 'VFV/J1690kzPWnFPyClMdAn+CxRBgAk0ixBXd9mGI38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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