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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5706bd70a6a59fc506480c8bbcac5a452e2ae1208dc3048562d2daa214bfb3d8' 
  AND token = 'vakRU5B51I+a4q+MMQi2rjWk76xe4CtAOibXbdVWtVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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