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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3be37bfacd6e3ef1d9fc9f6d18087f437565f561efb49d951a0d631729bc52' 
  AND token = 'bpKsvEzI9zToyFRl3Qm2O94UVZ1D9VIjROkA7n65umk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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